RU2219034C1 - Method for making assembling-welding jig for body parts of transport vehicles at changing one model for another - Google Patents

Abstract

FIELD: transport machine engineering, namely automobile manufacture. SUBSTANCE: method comprises steps of placing plate of jig with reference members for obtaining predetermined coordinate system onto reference plate of three-coordinate measuring machine; placing and aligning on said plate intermediate frame with fixing units; demounting worn plate of jig on frame of movable table and fixing units of struts of movable cars and placing onto it new plate of jig assembled with fixing units; approaching to jig plate movable carriages with struts and positioning them in working position; securing fixing units to struts of movable carriages; fixing all positioning members on joined transporting members of jig in working position; releasing movable fixing units secured to intermediate frame; moving movable carriages with struts and fixing units to initial position; demounting intermediate plate from plate of jig for free reception of welded parts. EFFECT: lowered cost of preparing production process, reduced labor consumption for assembling and adjusting assembling- welding fitting. 3 cl, 9 dwg

Description

 The invention relates to transport machinery, in particular to the automotive industry.

 A known method of assembly and commissioning of assembly-welding conductors using three-coordinate measuring machines (see a.c. 2135341 class. In 23 K 37/00), in which on the plate of a stationary three-coordinate measuring machine are installed and verified all the components of the conductors. After delivering them to the installation site, a portable three-coordinate measuring machine is used, usually mounted on the main plate of the welding jig.

 The disadvantage of this method is the high complexity, significant time spent on the installation of the components of the conductor and the mandatory presence in the production of a free portable three-coordinate measuring machine.

 The technical result achieved by the invention is to reduce the cost of preparing the production, reducing the complexity of the frills and adjusting the assembly and welding equipment.

To achieve the task:
- the conductor plate is installed on the control plate of a three-coordinate measuring machine,
- set the control elements on the conductor plate to obtain a given coordinate system (X, Y, Z in the car grid) relative to them (control elements),
- install and align on it an intermediate frame with fixation units placed during operation outside the conductor plate (for example, on racks of movable trolleys), then all other fixation units located during operation on the conductor plate,
- disassemble the old conductor plate from the frame of the movable table and fixation units from the racks of the movable carts (cart and table in the initial position),
- install a new conductor plate assembly with fixation units on the frame of the movable table (on existing mounting holes),
- bring to the conductor plate movable carts with racks in the working position,
- fixation units are mounted on racks of movable bogies,
- fix all positioning elements (retainer - sleeve) on the mating transport elements of the conductor in the working position (table and carts), realizing a rigid geometric relationship between them,
- disconnect the fastening of the movable fixation nodes from the intermediate frame mounted on the jig table,
- move the mobile trolleys with racks and fixation nodes to their original position,
- dismantle the intermediate frame from the plate of the conductor for the free reception of the welded parts.

 The essence of the proposed method is illustrated by drawings.

 Figure 1 shows the conductor assembly-welding of the base of the floor.

 Figure 2 shows the conductor assembly-welding of the base of the floor view A (figure 1).

 In FIG. Figure 3 shows the fixing units for installation and alignment on a three-coordinate measuring machine.

 Figure 4 shows the conductor plate assembly for installation on the frame of the roll-out table.

 Figure 5 shows the positioning element view G (figure 3).

 Figure 6 shows a conductor without an intermediate frame with a welded product.

 In Fig.7 shows the fixation unit of the welded part type B (Fig.2).

 In FIG. 8 shows the unit for fixing the welded part view D (figure 3).

 Figure 9 shows the movable fixing nodes disconnected from the intermediate frame.

 The conductor for assembly-welding of the front floor with the motor compartment is a roll-out table 1, on the frame 2 of which a conductor plate 3 is assembled assembled according to the mutual fixation units 4 (latch - sleeve).

 A draw-out table with a conductor plate is installed on the guide rails 5 and in the working position is positioned by the fixing unit 6.

 Side trolleys 7 with racks 8 and fixation nodes 9 of the parts to be welded move along the guides 10 and in the working position are fixed by fixation nodes 11. The position of the movable fixation nodes 9 on the racks 8 of the trolley 7 relative to the fixation nodes located on the conductor plate are defined by the mutual fixation nodes 12 ( latch - sleeve) (see figure 1).

 Reconciliation of the welding jig is performed on the control plate 13 of the three-coordinate raspberry for accurate access to the adopted coordinate system XYZ. Control elements 14, 15, 16, 17 — along the X, Z, 18, 19 axes — along the Y, Z axes, relative to which the working surfaces 20 of the support blocks 21 of the fixing blocks 21 of the fixation points of 22 welded parts, are set in the grid of the car on the conductor plate creating them the theoretical surface of the product.

 For alignment and control of the geometric position of the fixing nodes placed on the uprights 8 of the movable bogies 7, an intermediate frame 23, respectively, with the mutual fixing nodes 24, is installed on the conductor plate.

 The fixing unit 9 includes a plate 25, technological latches 26, racks 27 with support blocks 28. For alignment and installation of the node 9 on the intermediate frame and on the racks of the movable trolley there are bushings 29 and 30, respectively.

 A method of manufacturing an assembly-welding jig is as follows.

 The conductor plate 3 is installed on the control plate 13 of the control measuring machine (not shown), make a reconciliation in space and attach to the control plate in places of future mounting on the frame 2 of the roll-out table 1.

 Set the reference system X, Y, Z in the coordinate system of the designed car, that is, coinciding with the coordinate system X, Y, applied in the form of drawings mechanically on the conductor plate (for example, after 200 mm).

 To accurately enter a rectangular coordinate system throughout the assembly cycle, to ensure subsequent reconciliation and control operations, control elements 14, 15, 16 and 17 are set along the XY axes; 18 and 19 along the ZY axes.

 The control elements must have solid ground surfaces (HRC 60 at least), on which measurements are made.

 The plate of the conductor 3 should be rigid, without the presence of internal stresses and permanent deformations after final machining.

 After that, the installation and alignment of the working surfaces 20 of the support blocks and fixation nodes 22 are carried out at control points taken from mathematical models of the parts to be welded.

 The working surfaces 20 of the support blocks 21 and 28 are machined on CNC machines according to a program linked to the mathematical model of the part, and they accurately repeat the theoretical surface of the part of the body part.

 For alignment and installation in the adopted coordinate system of the movable fixation nodes 9, an intermediate frame 23 is installed and verified on the conductor plate 3, and then fixed by the mutual fixation nodes 24. The intermediate frame has strictly machined vertical platforms with mounting holes on which a plate of 25 nodes is verified and installed fixation by 9 latches 26 (repeating the positions of the base holes in the parts to be welded) and support blocks 28 according to previously set technological latches 26 through bushings 29, o while at the same time brazing the mutual fixation unit between the pads of the intermediate frame and the plate 25 of the fixing unit 9.

 Thus, after installation and alignment of the lateral fixing nodes 9 on the conductor plate 3, the working surfaces of the support blocks 21 and 28 create the complete theoretical surface of the welded assembly (for example, the base assembly with the motor compartment).

 The transition from one car model to another is as follows.

 The new conductor plate 3 is removed from the control plate 13 of the measuring three-coordinate machine and mounted on the frame 2 of the sliding table 1 by the mutual fixation units 4, after dismantling the old plate and fixation units from the racks of the movable carts (table position is working, the position of the carts is initial).

 The movable carts 7 with racks 8 are brought to the conductor plate 3 in the working position, that is, until the plate 25 is paired with the rack plate 8, the mating elements are mutually fixed by the latches 26 and bushings 30 with their subsequent fastening.

 After that, all the nodes of mutual fixation 4.11 and 12 (retainer - sleeve) are fixed on the mating movable elements of the conductor in the working position, making a rigid geometric connection between them.

 For complete readiness of the assembly-welding jig to work, disconnect the fastening of the movable fixation nodes 9 from the intermediate frame 23, move the movable trolleys 7 to their original position, dismantle the intermediate frame.

 Thus, the transition from one car model to another occurs in a very short time and without the use of a portable measuring machine. In addition, the position control of the movable fixation nodes is easily checked when installing an intermediate frame by interfacing technological latches with bushes.

 Using the described method allows the simultaneous assembly and alignment of all components and elements of the assembly-welding conductor in one installation on a plate of a stationary control and measuring machine and in this form can be transferred to a workstation for installation, which significantly reduces the transition time from one model to another without production shutdowns. All preparation of the assembly and welding jig to work is carried out in two hours without the use of a portable three-coordinate measuring machine. The economic effect of the introduction of a new car model is approximately 5 million rubles.

Claims (3)

1. A method of manufacturing an assembly-welding conductor of the vehicle body parts during the transition from one model to another, including the manufacture of its components and subsequent assembly using a stationary three-coordinate measuring machine, characterized in that a conductor plate is placed on a control plate of a three-coordinate measuring machine, install and align an intermediate frame on it with fixation units placed during operation outside the conductor plate, then all other fixation nodes, races laid on the conductor plate during the work, then dismantle the old conductor plate from the frame of the movable table and fixation units from the racks of the movable carts, install a new conductor plate, move the movable carts with racks to the working position and fix the fixation nodes on the working surfaces of the racks, then fix the positioning elements, while implementing a rigid geometric relationship between the transport elements of the jig, the jig table and trolleys, disconnect the mount under izhnyh fixing nodes of the intermediate frame is removed trolley in the initial position, the intermediate frame to disassemble the conductor plate for receiving the free welded parts. 2. The method according to claim 1, characterized in that the installation and control of the geometric position of the movable fixing units of the assembly-welding jig is carried out by means of an intermediate frame fixed to the jig plate. 3. The method according to claim 1, characterized in that when assembling the junction nodes are placed on the intermediate frame by means of two mounting systems - one connected to the intermediate frame, the other to the working surface of the mounting of the transport elements of the jig.

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